Keil Kraft Competitor enlarged for IPS
I've been dithering about where to post this (parkflyers? sport models? here? free flight, even...) but since in spirit it seems reasonably close to Vinto's Black Magic epic, and the Playboy thread, here it will go if that's OK with people.
As a small child I had quite a thing for the 32 inch span KK Competitor. It was bigger and more expensive than anything I could afford for a long time, and by the time I could afford it I had gone on to radio gliders. Recently I found one for sale on eBay and snapped it up. And thought about what to do with it for a long time. It seems a shame to build a 50 year old kit of an almost 60 year old design. And I don't have anywhere to fly free-flight anyway. So I took the plans off to my local copy shop and had a set enlarged to 40 inches span, with a view to installing an IPS and lightweight radio.
Along the way I have made many changes which will I hope make this a better parkflyer, though still in spirit a Competitor. I have tremendous respect for the work of designers like Bill Dean, who did the Competitor, and Albert Hatfull, responsible for many other KK designs. But I'm aware that they had to work within limited cost and complexity constraints to make kits come in at a price. I don't mind investing more time in making a more complex, lighter, stronger structure. I've also done a few things that I hope Bill would approve of, like putting back the curve into the tailplane leading edge. I'm sure that was only straightened for production-engineering purposes! And I've changed the airfoil, changed some angles, etc. to make it more airworthy as a lightweight RC sport model. I'll detail these as I go through. It's a 195 sq in wing (quite high aspect ratio) and I am hoping for 7.5 ounces ready-to-fly, rudder-elevator-throttle control with Feigao IPS-A, 9x7 GWS prop - [EDIT - changed to an 8x6 on A gearing, the 9 x 7 would be better with C gearing) , 2s 450 mAh LiPo. Loading will be 5.5 oz/ft2. Enough preamble, on with the build...
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